Tapping-machine



Patentd sept. e, |898.

H. A. TUTTLE.

TAPPING MACHINE.

(Application led Sept.. 29, 1897.)

No mou-ex.)

. im lllllllmlm @M7 /571 lara.

BY /ff@ ATTOR EY rrrcno HENRY AUGUSTUS TUTTLE, or srAMFoRD, connuc'ricur.y

-TAPPlNG-IVIACHINE.

SPECIFICATION" forming part of Letters Patent'No. 610,208, dated? September 6, 1898.

` Application filed September 29, 1897. Serial No. 653,439i (No model.)

T0 @ZZ whom, t may concern,.-

Beit known that I, HENRY AUGUSTUS TUT- TLE, residing at Stamford, in the county of Fairfield and State of Connecticut, have invented an Improved Tapping Machine, of which the followingis a specification Myinvention relates to machines of a class particularly adapted fortappin g,drillin g, and reaming.

The invention consists of an adjustablymounted table upon which the work is sustained, a revoluble tool-holding chuck adjacently journaled and having endwise movement to and from the table, which may be varied and automatically limited according to the requirements of the work, and suitable gearing for driving the chuck.

The points of invention lie in rotatably mounting a chuck in a manner to render it movable to and from the work, and in automatically limiting such movement to vary the depth of the cut as desired, and, finally, in various minor features to be hereinafter fully described and claimed.H

In the accompanying drawings similar letters indicate corresponding parts in the several views, in which- Figure l is a view in elevation of one ein-- p 5 is a sectional view of the driving mechanism thereof.

the latter being adjustably clamped thereon in any suitablemanner. Upomthe upper end of the standard a casting a3 is mounted Onel i of these arms extends rearwardly and is biand provided with three arms a4 a5 a6.

furcated to provide bearings, in which a shaft a7 is journaled, carrying a series of pulleys as co9. The arms a5 a6 project forwardly and terminate in heads, in which the driving groove (SL16 formed in the clutch-cone.

member ofthe chuck-spindle is rotatably mounted. Centrally between these heads a friction-clutch aw vis arranged, which. Vcomprises a double-cone clutch-pulley a, keyed or feathered upon the driving part of the chuck-spindle and adapted to engage either of the adjacentlymounted pulleys am am, which are loose butbelted up to run in opposite directions. .The desired direction of rotation is obtained through the employment of an endless belt al?, which passes around these pulleys and :is looped over a fast pulley and a loose pulley carried bythe drivingshaft in the rear. The clutch is operated by means of a hand or foot lever am, pivoted to the upper casting and extending outwardly, it being looped to engage a circumferential spring a is adjustably attached to this lever and, acting upwardly, tends to effect continuous engagement between the cone and upper clutch-pulley.`

B represents the chuck-spindle, which comprises two parts or members b b2, telescopically arranged one within the other in a manner to permit independent endwise movement of the inner member or spindle proper,which latter is sustained normally elevated by an encircling spring b3, acting against an annular shoulder formed by the upper end of the outer member.

The chuck b4 may be of any suitable orwellknown form, it being essential,however, in the application of the present invention that the casing thereof be peculiarly formed to provide two stops h5 b, one of which is circumferentially and the other axially disposed with respect to the casing,they being separated sufficiently to permit the free passing of a dog or pawl 197 carried by the outer or drivingmember. The upper end of the casing is tapped to receive the threaded extremity of the spindle, whereby they are rendered practically continuous.V The outer or driving member is journaled to rotate freely andmay `be keyed tothe double-cone pulleydto partake of both itsrotary and vertical motion, h`as illustrated in Fig. l, or of only its rotary motion, as shown in Fig. 5, in which latter case a` feather- IOO and-spline connection 68 would beemployed y;

to permit the independent adjustment ef the clutch-cone necessary for its engagement with the pulleys.

The operation of lthe construction just described involves a modification of the stops, as illustrated in Fig. 4, which consists in interposing a spring-dog b9 in the path of travel of the main or driving dog, so that it will yield in one direction and be sustained by a shoulder against movement in the opposite direction.

In setting or adjusting the machine the inner member or chuck-spindle proper is depressed against the action of its spring until the annular stop-shoulder engages the driving-dog, and the Work-carrying table is then elevated to bring the work into contact with the tool While the latter is in its lowered position. Continued movement of the table carries the tool upward until the driving-dog and stop-shoulder become separated a distance approximating the depth of cut required, at which point the table is secured. The spindle on being released is elevated by the action of its spring and the machine is then in operative condition. Power from the main driving-pulley is transmitted by belt to the clutchpulleys to drive them in opposite directions, and under the control of the clutch proper the chuck may be rotated as desired. As above stated, however, under the influence of the upward-acting spring the clutch-cone lies in engagement with the upper pulley, and thereby drives the tool in a right-hand direction through the medium of the driving-pawl acting against the axially-disposed stop or key. The tap or tool is entered by depressing the spindle and is self-feeding in the Well-known manner, the depth of cut being limited by bringing the tool to a state of rest. This is effected automatically by the escape of the stop or key from the dog, and the latter then runs freely under the annular shoulder. To withdraw the tool, the clutch-lever is depressed to close the cone with the lower pul- -ley and thereby reverse the direction of rotation. This movement of the cone carries the outer member of the spindle downward (see Fig. 1) until the driving-dog thereof engages the stop-key,upon which it acts, as above described. When the cone is feathered upon the spindle, the pivoted pawl will yield and permit the dog to rotate beneath the stopshoulder, and it is only necessary to reverse the direction of rotation, as the driving-dog will temporarily lock the pivoted pawl (see Fig. 4) in the notch forming its stop.

It will be understood that various changes may be made in the construction and arrangement Without departing from the spirit of my invention.

Having therefore described my invention, what I claim as new, and desire to protect by Letters Patent, is-

l. 'A chuck, comprising a spindle proper movable in the direction of its length and provided with an engaging projection, and a suitablycontrolled driving-sleeve engaging either side of said projection to rotate the spindle and being adapted to successively engage opposite sides thereof to effect the advance and withdrawal of the tool, as specified.

2. A chuck, comprising a spindle proper movable in the direction of its length and provided with an engaging projection, and a suitably-controlled driving-sleeve having a dog engaging said projection to rotate the spindle and being adapted to successively engage opposite sides thereof, to effect the advance and Withdrawal of the tool, as specified.

3. A chuck, comprising a spindle movable in the direction of its length and provided with an engaging projection, a suitably-controlled driving-sleeve having a dog engaging said projection to rotate the spindle and being adapted to successively engage opposite sides thereof to effect the advance or withdrawal of the tool, and a spring sustaining said parts normally in engagement, as specified.

4. The combination with reversible driving mechanism, of a chuck, comprising a spindle proper movable in the direction of its length and provided with an engaging projection, and a suitably-controlled driving-sleeve engaging either side of said projection to rotate.

the spindle and being adapted to successively engage opposite sides thereof to effect the advance and withdrawal of the tool, as specified.

5. The combination with reversible driving mechanism, of a chuck, comprising a spindle movable in the direction of its length and provided with an engaging projection, a suitably-controlled driving-sleeve having a dog engaging said projection to rotate the spindle and being adapted to successively engage opposite sides thereof to effect the advance or withdrawal of the tool, and a spring sustaining said parts normally in engagement, as specified.

6. The combination with reversible driving mechanism, of a chuck, comprising a driven member independently movable in the direction of its length, and provided with a circumferential flange, and an axially-disposed projection terminating adjacent to said flange, and a driving member adapted to engage either side of said projection for the purpose described.

In testimony whereof I afx my signature in the presence of two Witnesses.

HENRY AUGUSTUS TU'ITLE. [L s] lVitnesses:

GEO. H. RENAUD, GRAHAM R. HOLLY.

lOO

IIO 

